From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50160) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ebS3o-0002kw-3O for qemu-devel@nongnu.org; Tue, 16 Jan 2018 09:17:57 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ebS3m-0004Wz-SM for qemu-devel@nongnu.org; Tue, 16 Jan 2018 09:17:56 -0500 Received: from mail-wm0-x22e.google.com ([2a00:1450:400c:c09::22e]:45573) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1ebS3m-0004Wb-Mn for qemu-devel@nongnu.org; Tue, 16 Jan 2018 09:17:54 -0500 Received: by mail-wm0-x22e.google.com with SMTP id i186so8655080wmi.4 for ; Tue, 16 Jan 2018 06:17:54 -0800 (PST) Sender: Paolo Bonzini From: Paolo Bonzini Date: Tue, 16 Jan 2018 15:16:53 +0100 Message-Id: <1516112253-14480-12-git-send-email-pbonzini@redhat.com> In-Reply-To: <1516112253-14480-1-git-send-email-pbonzini@redhat.com> References: <1516112253-14480-1-git-send-email-pbonzini@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PULL 11/51] build-sys: add a rule to print a variable List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= From: Marc-André Lureau $ make print-CFLAGS CFLAGS=-fsanitize=address -Og -g Trick from various sources: https://stackoverflow.com/questions/16467718/how-to-print-out-a-variable-in-makefile https://www.cmcrossroads.com/article/printing-value-makefile-variable Signed-off-by: Marc-André Lureau Reviewed-by: Eric Blake Message-Id: <20180104160523.22995-4-marcandre.lureau@redhat.com> Tested-by: Philippe Mathieu-Daudé Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Paolo Bonzini --- Makefile | 5 ++++- docs/devel/build-system.txt | 13 +++++++++++++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 1671db3..f26ef1b 100644 --- a/Makefile +++ b/Makefile @@ -8,9 +8,12 @@ SRC_PATH=. UNCHECKED_GOALS := %clean TAGS cscope ctags dist \ html info pdf txt \ - help check-help \ + help check-help print-% \ docker docker-% vm-test vm-build-% +print-%: + @echo '$*=$($*)' + # All following code might depend on configuration variables ifneq ($(wildcard config-host.mak),) # Put the all: rule here so that config-host.mak can contain dependencies. diff --git a/docs/devel/build-system.txt b/docs/devel/build-system.txt index 386ef36..52501f2 100644 --- a/docs/devel/build-system.txt +++ b/docs/devel/build-system.txt @@ -510,3 +510,16 @@ default-configs/$TARGET-NAME file as input. This is the entrypoint used when make recurses to build a single system or userspace emulator target. It is merely a symlink back to the Makefile.target in the top level. + + +Useful make targets +=================== + +- help + + Print a help message for the most common build targets. + +- print-VAR + + Print the value of the variable VAR. Useful for debugging the build + system. -- 1.8.3.1